Thanks, Henry,
btw.. my litte programm GPU-Z says i am running Driver version ATI Calalyst 12.6.

ok, 1 year old...
(I tried to update, but after that the viewer showed a somehow weird slighlty destroyed image and even no tp-possibilty as usual so I went back to old version.)
However, I also cleard cache. Took no effect.
Now:
With the official viewer of linden from april this year I can teleport.
with Singularity Viewer 1.8 I can make snapshots and teleport.
Shall I try something else or wait for other updates?